Air control for engines



Sept. 5, 1933. o H SPENCER 1,925,851

AIR CONTROL FOR ENGINES Filed June 27, 1930 NVIINTOB Patented Sept. 5, 1933 UNITED STATES PATENT OFFiE This invention relates to air control for engines designed primarily for use in connection with four cycle internal combustion engines and one feature of the invention is the provision of means for entering air to the cylinders of an engine under more or less force.

A further feature of the invention is the provision of means for entering air direct to the air forcing means or through parts of the engine structure.

A further feature of the invention is the provision of means for regulating the feed of the air to the cylinders of the engine.

A further feature of the invention is the pro vision of means for directing the air to the force feed mechanism in such manner as to more or less impregnate the air with oil.

Other objects and advantages will be hereinafter more fully set forth and pointed out in the accompanying specification.

In the accompanying drawing which is made a part of this application,

The figure is a vertical sectional view thru an internal combustion engine, with parts broken out.

Referring to the drawing, the numeral 1 indicates the cylinder of the engine to which is attached a crank case 2, said cylinder having the conventional piston 3 mounted therein, which is operated by a connecting rod 4 and a crank 5.

Associated with the crank case 2 is a charger chamber 6, in which is eccentrically mounted a charger mechanism comprising a circular body portion 7, mounted upon and driven by a shaft 8, said body '7 having a plurality of radiating slots 9 in which are longitudinally slidable blades 10, the outer ends of which bear against the peripheral wall of the charger chamber 6. The main volume of air for the charger mechanism is entered into the chamber 6 thru a port 11, in which is mounted a manually operated valve 12, by means of which the volume of air entering thru the port 11 may be regulated or practically en tirely shut off.

5 In order to ventilate and cool to a degree, the interior of the crank case 2 and parts therein, the wall of the charger chamber 6 adjacent the crank case 2, is provided with a plurality of openings 13, thru which a limited amount of air may be drawn from the crank case 2. In order to supply said crank case with fresh air, a duct 14 is provided on said crank case, in the free end of which is entered a breather cap 15 which projects a distance above the duct 14, that part of the cap above the duct having openings 16 for the passage of air. The inner end of the cap 15 rests against a shoulder 17 within the duct 14 which limits the inward movement of the cap, while the outer end of the cap is provided with a cup shaped flange 18, which projects below the openings 16 and prevents foreign particles from being drawn into the crank case 2.

Communicating with the charger member 6 is an air passage 19, which conveys air from the charger chamber 6 to the lower end of the cylinder 1, and as the air is directed thru said pas sage with considerable force, a choke valve 20 is rotatably mounted in said passage and is operated by means of a lever 21.

Fuel is conveyed by suction as is common with four-cycle engines, to the cylinder 1 thru a carbureter 22, with which is associated a butter-fly valve 23, to which is attached an operating lever 24 and extending from said lever to any suitable point for ready manipulation is a rod 25. In order to operate the choke valve 20, and the butter-fly valve 23 in unison, a link 26 is extended from the lever 21 to the lever 24, so that when the lever 24 is operated to open or close the butter-fly valve, the choke valve 20 will be correspondingly operated in unison with said butter-fly valve, the choke valve 20 not only serves to regulate the flow of air thru the passage 19, but also serves to create a back pressure against the charger mechanism, which will result in checking the momentum of the motor, as when the engine is running idle, or when it is slowed down, by cutting down the supply of fuel thru the carbureter, and as the operation of the carbureter valve is transmitted to the choke valve, the effect of the choking action will be instantaneous with the closing of the carbureter valve.

As previously stated, the air for the charger mechanism may be mostly taken thru the port 11, but when desired, as in warm weather, the valve 12 may be partially or wholly closed, thus setting up a strong suction thru the openings 13, thus getting the supply of air thru the crank case 2, which will ventilate and cool the interior of said crank case, the state of the weather to a great extent determining the degree to which the valve 12 is closed. It will be also understood, of course, that a lesser amount of air will be required for the cylinder under certain conditions as in warm weather, hence the desired amount of air will be obtained from the crank case during the warm weather, which will be enriched by oil vapor and mist within the crank case 2.

The charger mechanism is driven from parts of the engine thru the shaft 8 which is conveniently coupled with the engine crank shaft 27 so that any braking action set up against the charging mechanism will be instantly imparted to the moving parts of the engine.

While I have illustrated in a general way, certain instrumentalities which may be employed in carrying my invention into effect, it is evident that many modifications may be made in the various details, without departing from the scope of the appending claims, it being understood that my invention is not restricted to the particular examples herein described.

I claim as my invention: I 1. In a combined air control for "engines, th combination with a crank case of an engine, and means for entering air into said crank case, of an air moving mechanism associated with said crank case, a port for admitting air -to said mechanism, a valve for regulating or cutting oil the supply of air thru said port, and means for obtaining a su'pplyof air for 'said "mechanism from the interior of thecrankjcase when said valve is closed, whereby said crank case will be ventilated and the interior thereof'coo'led.

2. In a combined air control for engines, the combination with the crank case of an engine having openings thru one Wall thereof and a duct for conveying air into said crank case, of an air conveying chamber attached to said crank case and registering over said openings said chamber having a port for the admission of air, an air propeller mounted in said chamber, and a valve for regulating the passage of air thru said port, or choking the same for causing the air for said mechanism to be drawn thru the crank case.

3. The combination with the crank case of an engine having a plurality of openings adjacent one-end thereof and an air duct near the opposite end thereof, of an air moving mechanism, a casing surrounding said mechanism and covering said openings in the crank case, whereby air will be drawn thru 'the crank case to supply the said mechanism, a cap fitting within the end of said duct having openings for the admission of air, and 'a-flange for protecting said openings in the cap.

OWEN H. SPENCER. 

